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Record Information
Creation Date2008-10-29 12:24:48 UTC
Update Date2013-03-26 22:15:27 UTC
Secondary Accession NumbersNone
Metabolite Identification
Common NameDHAP(18:0)
DescriptionDHAP(18:0) is the octadecanoyl derivative of dihydroxyacetone phosphate. It is also known as an alkyl-DHAP. This compound is formed by octadecanoic acid reacting with DHAP. Alkyl-DHAPs are intermediates in the synthesis of ether phospholipids. The initial steps of ether phospholipid biosynthesis take place in peroxisomes. Alkyl-dihydroxyacetonephosphate synthase is the peroxisomal enzyme that actually introduces the ether linkage. Levels of Alkyl-DHAP have been found to be strongly reduced in human fibroblasts derived from Zellweger syndrome and rhizomelic chondrodysplasia punctata patients. Four other enzymes are known to be involved in the metabolism of acyl-DHAP and alkyl-DHAP. These include: acyl-DHAP/alkyl-DHAP oxidoreductase, DHAP acyltransferase, alkyl-DHAP phosphohydrolase, and a dinitrofluorobenzene-insensitive acyl-DHAP acylhydrolase. Dihydroxyacetone phosphate (DHAP) is a biochemical compound primarily involved in the glycolysis metabolic pathway. DHAP is also the product of the dehydrogenation of L-glycerol-3-phosphate which is part of the entry of glycerol (sourced from triglycerides) into the glycolytic pathway. Conversely, reduction of glycolysis-derived DHAP to L-glycerol-3-phosphate provides adipose cells with the activated glycerol backbone they require to synthesize new triglycerides. Both reactions are catalyzed by the enzyme glycerol 3-phosphate dehydrogenase with NAD+/NADH as cofactor. DHAP may be referred to as glycerone phosphate in older texts. 1-Octadecyl-glycerone-3-phosphate is an intermediate in Ether lipid metabolism. DHAP(18:0) or 1-Octadecanoyl-glycerone-3-phosphate is the precursor to 1-Octadecyl-glycerone-3-phosphate DHAP(18:0e) which is generated via alkylglycerone phosphate synthase (EC: Ether lipids are lipids in which one or more of the carbon atoms on glycerol is bonded to an alkyl chain via an ether linkage, as opposed to the usual ester linkage. Ether lipids are called plasmalogens (1-O-1'-alkenyl-2-acylglycerophospholipids) if these are glycerol-containing phospholipids with an unsaturated O-(1-alkenyl) (vinyl ether) group at the first position on the glycerol chain. Plasmalogens as well as some 1-O-alkyl lipids are ubiquitous and sometimes major parts of the cell membranes in mammals and anaerobic bacteria. In archaea, ether lipids are the major polar lipids in the cell envelope and their abundance is one of the major characteristics that separate this group of prokaryotes from the bacteria. In these cells, diphytanylglycerolipids or bipolar macrocyclic tetraethers can form covalently linked 'bilayers'. (Wikipedia)
  1. 1-Octadecanoyl DHAP
  2. 1-Octadecanoyl Dihydroxyacetone phosphate
  3. 1-Octadecanoyl-glycerone-3-phosphate
  4. 1-Stearoylglycerone 3-phosphate
Chemical FormulaC21H41O7P
Average Molecular Weight436.5198
Monoisotopic Molecular Weight436.258990178
IUPAC Name[3-(octadecanoyloxy)-2-oxopropoxy]phosphonic acid
Traditional Name3-(octadecanoyloxy)-2-oxopropoxyphosphonic acid
CAS Registry NumberNot Available
InChI Identifier
Chemical Taxonomy
KingdomOrganic Compounds
Super ClassLipids
ClassFatty Acid Esters
Sub ClassN/A
Other Descriptors
  • 1-acylglycerone 3-phosphate(ChEBI)
  • Aliphatic Acyclic Compounds
  • Alpha Ketoaldehyde
  • Carboxylic Acid Ester
  • Ketone
  • Organic Hypophosphite
  • Organic Phosphite
  • Phosphoric Acid Ester
Direct ParentFatty Acid Esters
StatusExpected but not Quantified
  • Endogenous
  • Food
  • Cell signaling
  • Fuel and energy storage
  • Fuel or energy source
  • Membrane integrity/stability
  • Nutrients
  • Stabilizers
  • Surfactants and Emulsifiers
Cellular locations
  • Extracellular
  • Membrane
Physical Properties
Experimental Properties
Melting PointNot AvailableNot Available
Boiling PointNot AvailableNot Available
Water SolubilityNot AvailableNot Available
LogPNot AvailableNot Available
Predicted Properties
Water Solubility0.000847ALOGPS
pKa (Strongest Acidic)1.19ChemAxon
pKa (Strongest Basic)-7ChemAxon
Physiological Charge-2ChemAxon
Hydrogen Acceptor Count5ChemAxon
Hydrogen Donor Count2ChemAxon
Polar Surface Area110.13 Å2ChemAxon
Rotatable Bond Count22ChemAxon
Refractivity113.27 m3·mol-1ChemAxon
Polarizability50.42 Å3ChemAxon
SpectraNot Available
Biological Properties
Cellular Locations
  • Extracellular
  • Membrane
Biofluid LocationsNot Available
Tissue LocationNot Available
Plasmalogen SynthesisSMP00479Not Available
Normal Concentrations
Not Available
Abnormal Concentrations
Not Available
Associated Disorders and Diseases
Disease ReferencesNone
Associated OMIM IDsNone
DrugBank IDNot Available
DrugBank Metabolite IDNot Available
Phenol Explorer Compound IDNot Available
Phenol Explorer Metabolite IDNot Available
FoodDB IDFDB027912
KNApSAcK IDNot Available
Chemspider ID389126
KEGG Compound IDC03805
BioCyc IDNot Available
BiGG IDNot Available
Wikipedia LinkNot Available
NuGOwiki LinkHMDB11133
Metagene LinkHMDB11133
METLIN IDNot Available
PubChem Compound440127
PDB IDNot Available
ChEBI ID36476
Synthesis ReferenceNot Available
Material Safety Data Sheet (MSDS)Not Available
General ReferencesNot Available


General function:
Involved in catalytic activity
Specific function:
1-acyl-glycerone 3-phosphate + a long-chain alcohol = an alkyl-glycerone 3-phosphate + a long-chain acid anion
Gene Name:
Uniprot ID:
Molecular weight: